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diff --git a/slideshow/source/inc/unoview.hxx b/slideshow/source/inc/unoview.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_SLIDESHOW_SOURCE_INC_UNOVIEW_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_UNOVIEW_HXX
+
+#include "view.hxx"
+#include <com/sun/star/uno/Reference.hxx>
+
+#include <vector>
+
+namespace com::sun::star::presentation { class XSlideShowView; }
+
+
+/* Definition of UnoView interface */
+
+namespace slideshow
+{
+    namespace internal
+    {
+        /** Extend View with UNO interface retrieval.
+
+            This interface extends View with a UNO interface
+            retrieval, to be used for Views which are set from
+            external API.
+         */
+        class UnoView : public View
+        {
+        public:
+            /** Retrieve the underlying UNO slide view.
+             */
+            virtual css::uno::Reference< css::presentation::XSlideShowView > getUnoView() const = 0;
+
+            /** Dispose view
+
+                This needs to be different from Disposable interface,
+                as the UNO XComponent also provides a dispose() (only
+                with a different calling convention under Windows).
+             */
+            virtual void _dispose() = 0;
+
+            /** Return whether the sound play back is enabled.
+            */
+            virtual bool isSoundEnabled() const = 0;
+
+            /** Tell the view whether it may play sounds.  Disabling this
+                can be used to prevent different views to play the same
+                sounds at the same time.
+            */
+            virtual void setIsSoundEnabled (const bool bValue) = 0;
+        };
+
+        typedef std::shared_ptr< UnoView >      UnoViewSharedPtr;
+        typedef std::vector< UnoViewSharedPtr >   UnoViewVector;
+    }
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_UNOVIEW_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */